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Goodwill and Intangible Assets, Net of Accumulated Amortization (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended |
--- | --- | ---
May 31, 2012 | May 31, 2011
Components of intangible assets, at cost |  |
Client lists | $ 223.6 | $ 223.4
Other intangible assets | 2.0 | 2.0
Total intangible assets, gross | 225.6 | 225.4
Less: Accumulated amortization | 169.8 | 148.2
Intangible assets, net of accumulated amortization | 55.8 | 77.2
Estimated future amortization expense relating to intangible asset balances |  |
2013 | 18.1 |
2014 | 13.0 |
2015 | 9.2 |
2016 | 6.4 |
2017 | $ 4.4 |

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